Aaltosalmi, Urpo Fluid flow in porous media with the lattice-Boltzmann method Jyväskylä: University of Jyväskylä, 2005, 158 p. (Research report/Department of Physics, University of Jyväskylä, ISSN 0075-465X; 3/2005) ISBN 951-39-2222-7 Diss. The lattice-Boltzmann method has recently become a useful approach for computational fluid dynamics. Simple implementation of boundary conditions together w...

The present study delivers several numerical experiments, conducted on a converging–diverging horizontal nozzle with the insertion of single and multiple circular cylinders. fluid enters from inlet wall, strikes nozzle's cylinder's walls times, affecting entire flow region, and, finally, leaves through outlet wall. This process leads to many new unseen things. lattice Boltzmann method relaxatio...

This study systematically examines the influence of length dual splitter plates placed at front and rear sides two side-by-side square cylinders on flow features fluid force reduction. The Reynolds number is kept 150 for all computations, separation ratio plate are varied from 0.5 to 5 1 5, respectively. method investigation single-relaxation-time lattice Boltzmann method. vortex shedding suppr...

When using a lattice Boltzmann method on an unbounded (or very large) domain one has to confine this spatial domain to a computational domain. This is realized by introducing so-called artificial boundary conditions. Until recently, characteristic boundary conditions for the Euler equations were considered and adapted to the lattice Boltzmann method. In this work we propose novel discrete artif...

We propose a formal expansion of multiple relaxation times lattice Boltzmann schemes in terms single infinitesimal numerical variable. The result is system partial differential equations for the conserved moments scheme. presented nonlinear case up to fourth order accuracy. asymptotic corrections nonconserved are developed equilibrium values and differentials moments. Both expansions coupled co...

In this paper, a simple method is proposed to obtain steady analytical solutions for the lattice Boltzmann method. Based on such analytical results, it is demonstrated how the accuracy of the lattice Boltzmann method can depend on the relative orientation of the lattice and the flow field. It is also demonstrated that the method can be useful to obtain a general class of analytical solutions fo...

We develop a three-dimensional immersed boundary chromodynamic multicomponent lattice Boltzmann method capable of simulating vesicles, such as erythrocytes. The presented is encapsulated in single framework, where the application force automatically adaptive interfacial region results correct vesicle behavior. also set down methodology for computing principal curvatures surface three-dimensiona...

In this thesis, the multiple-relaxation-time model of the collision operator in the lattice Boltzmann method is presented. In contrast to the simple Bhatnagar-GrossKrook approximation, not only a single but various relaxation parameters are available and can be used to optimise the simulation results. The main idea behind this approach is the construction of a space based on the moments of the ...